By typing M-x jabber-mode-line-mode you toggle display of some status in mode lines. The information is your own presence status, and some numbers showing the status of your roster contacts. By default, there are three numbers, for “online” (chatty and online), “away” (away, extended away and do not disturb) and offline contacts.
If you set
jabber-mode-line-compact to nil, you get a complete
breakdown of presence status. That gives you six numbers indicating
the number of chatty, online, away, extended away, dnd, and offline